My OS .75AX can only reach a peak of 10,000rpm with an APC 14x6 prop. The throttle response and spool up is pretty good.

What brand of prop are you using? I've tried the MA Schimitar props on several engines and they always show much higher numbers than APC's. My OS .91 Surpass II 4-stroke gets 9,500rpm with the APC 14x6 but delivers 9,700rpm with the MA Schimitar 15x6.

Your data of 10,100 on a 14x6 is useless without knowing what prop you are using. It might be achievable with a narrow blade prop or a Schimitar, but i'd doubt those figures. I'd also like to see how good the throttle response is. If it takes a while to spool up and get on the pipe then it makes for a very difficult flying model.